PHP imagecreatefromgif函数代码示例

 static function load($filename)
 {
     $info = getimagesize($filename);
     list($width, $height) = $info;
     if (!$width || !$height) {
         return null;
     }
     $image = null;
     switch ($info['mime']) {
         case 'image/gif':
             $image = imagecreatefromgif($filename);
             break;
         case 'image/jpeg':
             $image = imagecreatefromjpeg($filename);
             break;
         case 'image/png':
             $image = imagecreatetruecolor($width, $height);
             $white = imagecolorallocate($image, 255, 255, 255);
             imagefill($image, 0, 0, $white);
             $png = imagecreatefrompng($filename);
             imagealphablending($png, true);
             imagesavealpha($png, true);
             imagecopy($image, $png, 0, 0, 0, 0, $width, $height);
             imagedestroy($png);
             break;
     }
     if ($image) {
         return new image($image, $width, $height);
     } else {
         return null;
     }
 }

function convertImage($originalImage, $outputImage, $quality = 100)
{
    $myfile = fopen($outputImage, "w");
    // jpg, png, gif or bmp?
    $exploded = explode('.', $originalImage);
    $ext = $exploded[count($exploded) - 1];
    if (preg_match('/jpg|jpeg/i', $ext)) {
        $imageTmp = imagecreatefromjpeg($originalImage);
    } else {
        if (preg_match('/png/i', $ext)) {
            $imageTmp = imagecreatefrompng($originalImage);
        } else {
            if (preg_match('/gif/i', $ext)) {
                $imageTmp = imagecreatefromgif($originalImage);
            } else {
                if (preg_match('/bmp/i', $ext)) {
                    $imageTmp = imagecreatefrombmp($originalImage);
                } else {
                    return 0;
                }
            }
        }
    }
    imagejpeg($imageTmp, $outputImage, $quality);
    imagedestroy($imageTmp);
    return $outputImage;
}

 /**
  * Loads image source and its properties to the instanciated object
  *
  * @param string $filename
  * @return ImageResize
  * @throws \Exception
  */
 public function __construct($filename)
 {
     $image_info = @getimagesize($filename);
     if (!$image_info) {
         throw new \Exception('Could not read file');
     }
     list($this->original_w, $this->original_h, $this->source_type) = $image_info;
     switch ($this->source_type) {
         case IMAGETYPE_GIF:
             $this->source_image = imagecreatefromgif($filename);
             break;
         case IMAGETYPE_JPEG:
             $this->source_image = $this->imageCreateJpegfromExif($filename);
             // set new width and height for image, maybe it has changed
             $this->original_w = ImageSX($this->source_image);
             $this->original_h = ImageSY($this->source_image);
             break;
         case IMAGETYPE_PNG:
             $this->source_image = imagecreatefrompng($filename);
             break;
         default:
             throw new \Exception('Unsupported image type');
             break;
     }
     return $this->resize($this->getSourceWidth(), $this->getSourceHeight());
 }

 /**
  * MÉTODO CONSTRUTOR
  *
  * @author Gibran
  */
 function Imagem($arquivo)
 {
     if (is_file($arquivo)) {
         $this->Arquivo = $arquivo;
         // OBTÉM OS DADOS DA IMAGEM
         $this->ColecaoDados = getimagesize($this->Arquivo);
         // CARREGA A IMAGEM DE ACORDO COM O TIPO
         switch ($this->ColecaoDados[2]) {
             case 1:
                 $this->Recurso = imagecreatefromgif($this->Arquivo);
                 $this->Tipo = "image/gif";
                 break;
             case 2:
                 $this->Recurso = imagecreatefromjpeg($this->Arquivo);
                 $this->Tipo = "image/jpeg";
                 imageinterlace($this->Recurso, true);
                 break;
             case 3:
                 $this->Recurso = imagecreatefrompng($this->Arquivo);
                 $this->Tipo = "image/png";
                 imagealphablending($this->Recurso, false);
                 imagesavealpha($this->Recurso, true);
                 break;
             default:
                 $this->ColecaoDados = null;
                 $this->Recurso = null;
                 $this->Tipo = null;
                 return null;
                 break;
         }
     } else {
         return null;
     }
 }

function mkthumb($img_src, $img_width = "100", $img_height = "100", $folder_scr = "include/files", $des_src = "include/files")
{
    // Größe und Typ ermitteln
    list($src_width, $src_height, $src_typ) = getimagesize($folder_scr . "/" . $img_src);
    if (!$src_typ) {
        return false;
    }
    // calculate new size
    if ($src_width >= $src_height) {
        $new_image_height = $src_height / $src_width * $img_width;
        $new_image_width = $img_width;
        if ($new_image_height > $img_height) {
            $new_image_width = $new_image_width / $new_image_height * $img_height;
            $new_image_height = $img_height;
        }
    } else {
        $new_image_width = $src_width / $src_height * $img_height;
        $new_image_height = $img_height;
        if ($new_image_width > $img_width) {
            $new_image_height = $new_image_height / $new_image_width * $img_width;
            $new_image_width = $img_width;
        }
    }
    // for the case that the thumbnail would be bigger then the original picture
    if ($new_image_height > $src_height) {
        $new_image_width = $new_image_width * $src_height / $new_image_height;
        $new_image_height = $src_height;
    }
    if ($new_image_width > $src_width) {
        $new_image_height = $new_image_height * $new_image_width / $src_width;
        $new_image_width = $src_width;
    }
    if ($src_typ == 1) {
        $image = imagecreatefromgif($folder_scr . "/" . $img_src);
        $new_image = imagecreate($new_image_width, $new_image_height);
        imagecopyresampled($new_image, $image, 0, 0, 0, 0, $new_image_width, $new_image_height, $src_width, $src_height);
        imagegif($new_image, $des_src . "/" . $img_src . "_thumb", 100);
        imagedestroy($image);
        imagedestroy($new_image);
        return true;
    } elseif ($src_typ == 2) {
        $image = imagecreatefromjpeg($folder_scr . "/" . $img_src);
        $new_image = imagecreatetruecolor($new_image_width, $new_image_height);
        imagecopyresampled($new_image, $image, 0, 0, 0, 0, $new_image_width, $new_image_height, $src_width, $src_height);
        imagejpeg($new_image, $des_src . "/" . $img_src . "_thumb", 100);
        imagedestroy($image);
        imagedestroy($new_image);
        return true;
    } elseif ($src_typ == 3) {
        $image = imagecreatefrompng($folder_scr . "/" . $img_src);
        $new_image = imagecreatetruecolor($new_image_width, $new_image_height);
        imagecopyresampled($new_image, $image, 0, 0, 0, 0, $new_image_width, $new_image_height, $src_width, $src_height);
        imagepng($new_image, $des_src . "/" . $img_src . "_thumb");
        imagedestroy($image);
        imagedestroy($new_image);
        return true;
    } else {
        return false;
    }
}

 /**
  * @param string $fileName
  * @param array $options
  * @param array $plugins
  */
 public function __construct($fileName, $options = array(), array $plugins = array())
 {
     parent::__construct($fileName, $options, $plugins);
     $this->determineFormat();
     $this->verifyFormatCompatiblity();
     switch ($this->format) {
         case 'GIF':
             $this->oldImage = @imagecreatefromgif($this->fileName);
             break;
         case 'JPG':
             $this->oldImage = @imagecreatefromjpeg($this->fileName);
             break;
         case 'PNG':
             $this->oldImage = @imagecreatefrompng($this->fileName);
             break;
         case 'STRING':
             $this->oldImage = @imagecreatefromstring($this->fileName);
             break;
     }
     if (!is_resource($this->oldImage)) {
         throw new \Exception('Invalid image file');
     } else {
         $this->currentDimensions = array('width' => imagesx($this->oldImage), 'height' => imagesy($this->oldImage));
     }
 }

 private function createnewpicture()
 {
     $local = $this->path_two . $this->file['name'];
     move_uploaded_file($this->file['tmp_name'], $local);
     $filename = $this->file['tmp_name'] . "/" . $this->file['name'];
     $this->location = $this->path . "/" . $this->file['name'];
     switch ($this->file['type']) {
         case 'image/jpeg':
             $src = imagecreatefromjpeg($local);
             break;
         case 'image/png':
             $src = imagecreatefrompng($local);
             break;
         case 'image/gif':
             $src = imagecreatefromgif($local);
             break;
         default:
             break;
     }
     $sx = imagesx($src);
     $sy = imagesy($src);
     $new_image = imagecreatetruecolor($this->newwidth, $this->newheight);
     if (imagecopyresized($new_image, $src, 0, 0, 0, 0, $this->newwidth, $this->newheight, $sx, $sy)) {
         if (ImageJpeg($new_image, $this->location) || Imagegif($new_image, $this->location) || Imagepng($new_image, $this->location)) {
             //imagejpeg($this->location);
             return true;
         }
     } else {
         return false;
     }
 }

 static function resizewidth($width, $imageold, $imagenew)
 {
     $image_info = getimagesize($imageold);
     $image_type = $image_info[2];
     if ($image_type == IMAGETYPE_JPEG) {
         $image = imagecreatefromjpeg($imageold);
     } elseif ($this->image_type == IMAGETYPE_GIF) {
         $image = imagecreatefromgif($imageold);
     } elseif ($this->image_type == IMAGETYPE_PNG) {
         $image = imagecreatefrompng($imageold);
     }
     $ratio = imagesy($image) / imagesx($image);
     $height = $width * $ratio;
     //$width = imagesx($image) * $width/100;
     // $height = imagesx($image) * $width/100;
     $new_image = imagecreatetruecolor($width, $height);
     imagecopyresampled($new_image, $image, 0, 0, 0, 0, $width, $height, $image_info[0], $image_info[1]);
     $image = $new_image;
     $compression = 75;
     $permissions = null;
     if ($image_type == IMAGETYPE_JPEG) {
         imagejpeg($image, $imagenew, $compression);
     } elseif ($image_type == IMAGETYPE_GIF) {
         imagegif($image, $imagenew);
     } elseif ($image_type == IMAGETYPE_PNG) {
         imagepng($image, $imagenew);
     }
     if ($permissions != null) {
         chmod($imagenew, $permissions);
     }
 }

function create_thumbnail($filename)
{
    $percent = 0.1;
    list($width, $height) = getimagesize("/var/www/amberandbrice.com/workspace/images/" . $filename);
    $newwidth = $width * $percent;
    $newheight = $height * $percent;
    $thumb = imagecreatetruecolor($newwidth, $newheight);
    $ext = pathinfo($filename)['extension'];
    echo "<h1>{$ext}</h1>";
    switch ($ext) {
        case 'jpg':
        case 'jpeg':
        case 'JPG':
            $source = imagecreatefromjpeg("images/" . $filename);
            imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
            imagejpeg($thumb, "./thumbs/" . $filename);
            break;
        case 'gif':
            $source = imagecreatefromgif("images/" . $filename);
            imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
            imagejpeg($thumb, "./thumbs/" . $filename);
            break;
        case 'png':
            $source = imagecreatefrompng("images/" . $filename);
            imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
            imagejpeg($thumb, "./thumbs/" . $filename);
            break;
        default:
            die("image extension cannot be determined");
    }
}

 public function getLogo()
 {
     $f_info = pathinfo($this->url_logo);
     $get_w = $this->input->get('w');
     $get_h = $this->input->get('h');
     // Get new sizes
     list($width, $height) = getimagesize($this->url_logo);
     $newwidth = $get_w === FALSE ? $this->size_x : $get_w;
     $newheight = $get_h === FALSE ? $this->size_y : $get_h;
     $thumb = imagecreatetruecolor($newwidth, $newheight);
     //compress picture size
     if (strtolower($f_info['extension']) == 'jpg') {
         $image = imagecreatefromjpeg($this->url_logo);
         $call = 'imagejpeg';
         $content = 'image/jpeg';
     }
     if (strtolower($f_info['extension']) == 'png') {
         $image = imagecreatefrompng($this->url_logo);
         $call = 'imagepng';
         $content = 'image/jpeg';
     }
     if (strtolower($f_info['extension']) == 'gif') {
         $image = imagecreatefromgif($this->url_logo);
         $call = 'imagegif';
         $content = 'image/gif';
     }
     @header('Content-Type : ' . $content);
     imagecopyresized($thumb, $image, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
     call_user_func($call, $thumb);
     imagedestroy($thumb);
 }

 public function open($file)
 {
     $this->close();
     // *** Get extension
     $extension = strtolower(strrchr($file, '.'));
     switch ($extension) {
         case '.jpg':
         case '.jpeg':
             $this->image = @imagecreatefromjpeg($file);
             break;
         case '.gif':
             $this->image = @imagecreatefromgif($file);
             break;
         case '.png':
             $this->image = @imagecreatefrompng($file);
             break;
         default:
             $this->image = FALSE;
             break;
     }
     if ($this->image !== FALSE) {
         // *** Get width and height
         $this->width = imagesx($this->image);
         $this->height = imagesy($this->image);
     }
     return $this->image;
 }

 protected function getImage($image_url)
 {
     $this->url = $image_url;
     $mime = image_type_to_mime_type(exif_imagetype($image_url));
     $im;
     //Get image based on mime and set to $im
     switch ($mime) {
         case 'image/jpeg':
             $im = imagecreatefromjpeg($image_url);
             break;
         case 'image/gif':
             $im = imagecreatefromgif($image_url);
             break;
         case 'image/png':
             $im = imagecreatefrompng($image_url);
             break;
         case 'image/wbmp':
             $im = imagecreatefromwbmp($image_url);
             break;
         default:
             return NULL;
             break;
     }
     $this->image = $im;
     return $this;
 }

 function resizeThumbnailImage($thumb, $image, $width, $height, $start_width, $start_height, $scale)
 {
     $newImageWidth = ceil($width * $scale);
     $newImageHeight = ceil($height * $scale);
     $newImage = imagecreatetruecolor($newImageWidth, $newImageHeight);
     $ext = strtolower(substr(basename($image), strrpos(basename($image), '.') + 1));
     $source = '';
     if ($ext == 'png') {
         $source = imagecreatefrompng($image);
     } elseif ($ext == 'jpg' || $ext == 'jpeg') {
         $source = imagecreatefromjpeg($image);
     } elseif ($ext == 'gif') {
         $source = imagecreatefromgif($image);
     }
     imagecopyresampled($newImage, $source, 0, 0, $start_width, $start_height, $newImageWidth, $newImageHeight, $width, $height);
     $ext = strtolower(substr(basename($thumb), strrpos(basename($thumb), '.') + 1));
     if ($ext == 'png') {
         $result = imagepng($newImage, $thumb, 0);
     } elseif ($ext == 'jpg' || $ext == 'jpeg') {
         $result = imagejpeg($newImage, $thumb, 90);
     } elseif ($ext == 'gif') {
         $result = imagegif($newImage, $thumb);
     }
     if (!$result) {
         return false;
     }
     chmod($thumb, 0664);
     return $thumb;
 }

 public function load($path, $extension = null, $content = null)
 {
     global $F;
     $this->destroy();
     $this->path = $path;
     if (is_null($extension)) {
         $extension = File::extension($path);
     }
     switch ($extension) {
         default:
         case "jpg":
             $this->resourceID = @imagecreatefromjpeg($path);
             break;
         case "gif":
             $this->resourceID = @imagecreatefromgif($path);
             break;
         case "png":
             $this->resourceID = @imagecreatefrompng($path);
             imagesavealpha($this->resourceID, true);
             break;
         case Image::DATA:
             $this->resourceID = @imagecreatefromstring($content);
             break;
     }
     if ($this->resourceID) {
         $this->width = imagesx($this->resourceID);
         $this->height = imagesy($this->resourceID);
         return true;
     } else {
         return false;
     }
 }

 public static function create_from($filename)
 {
     $size = @getimagesize($filename);
     if (FALSE == $size) {
         return NULL;
     }
     list($w, $h, $type) = $size;
     $obj = new self();
     switch ($type) {
         // 1 = GIF，2 = JPG，3 = PNG ...
         case 1:
             // gif
             $obj->im = imagecreatefromgif($filename);
             break;
         case 2:
             // jpg
             $obj->im = imagecreatefromjpeg($filename);
             break;
         case 3:
             // png
             $obj->im = imagecreatefrompng($filename);
             break;
         default:
             $obj->im = FALSE;
             break;
     }
     if (FALSE == $obj->im) {
         return NULL;
     }
     return $obj;
 }